Many thanks to Alex for this, the change in idle quality is just stupid; you can't even really tell it's running now. General around town driving on the way home felt much smoother too.
Alex is a super nice guy and the experience was perfect and painless, even with a rental car thrown in. Let's fill up these slots and make his trip worth it!
Here's a couple of pictures he shot for me (click for full-size); mine is just over 83k miles and had never been cleaned.